Minor tweaks to the TitleBar documentation to point to the WindowsAppSDK release notes and mark as experimental

Author: michael-hawker

components/TitleBar/samples/TitleBar.md

@@ -7,11 +7,15 @@ dev_langs:
   - csharp
 category: Controls
 subcategory: Layout
+experimental: true
 discussion-id: 0
 issue-id: 0
 icon: assets/icon.png
 ---
 
+> [!NOTE]
+> WindowsAppSDK 1.6-experimental introduced a TitleBar control based on the work here in the Toolkit. If you're using WindowsAppSDK and plan to use 1.6 when it becomes available, find more information about the new control here: https://learn.microsoft.com/windows/apps/windows-app-sdk/experimental-channel#new-titlebar-control
+
 The `TitleBar` provides an easy way to display a modern titlebar experience. The control handles all the required APIs to extend content into the titlebar area and set custom drag regions. The control is set up in a way that it handles the correct design guidelines while being flexible in what content to show.
 
 > [!Sample TitleBarConfigSample]